Cutting tool



June 4, 1946.

CUTTING TOOL Filed March 16, 1944 2 Sheets-Sheet l X C. 3 n1- 4 ll. 0 l

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June 4, 19 4 6. E,I GRIEENEIETAL 2,401,420; CUTTING TOOL Filed March 16,1944 v 2- Sh eQts-S heet ,2

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UNED STATES PATENT OFFICE CUTTING TOOL Edmund Greene, Narberth, andHenry F. Pearson, Langhorne, Pa., assignors to Riihm & Haas Company,Philadelphia, Pa., a corporation of Delaware Application March 16, 1944,Serial No. 526,784

2 Claims. (CI. 77-69) 1 2 The present invention relates to cutting toolsPart 6, 8, 9, Ill, and H are free to rotate about particularly adaptedfor cutting? apertures in a vertical axis through the center of stud Iand curved surfaces without requiring that the curved tubular member 5.

surface be first flattened into a sheet prior to In operation, the toolis clamped to sheetX and being cut. Every point on the circumference of5 pressure is applied to knob 8 which causes arms the aperture which maybe cut in a curved sur- 6 to press on collar H, thus flexing plate 9 andface by tools of the type herein described is equiforcing the cutter ll]against sheet X. The device distant from a point located centrallythereof is then rotated and cuts a hole in the sheet maupon the surfaceof curvature, when measured terial. along a line drawn on the curvedsurface from 10 The additional pins [3 make it possible to place thelast-mentioned point to the circumference. the cutter at variouspositions along plate 9.

Tools heretofore employed for cutting such open- It is apparent to oneskilled in the art that the ings are adapted for such purpose only whenthe various parts of the device may be altered withsheet to be out has aconstant radius of curvaout departing from the scope of this invention.

ture in all directions. They are not adapted to In essence, this devicecomprises a clamping ascut holes in sheets whose radius of curvature insembly and a, cutting assembly, th latter being one straight linedirection is different from its free to rotate around the clampingdevice and radius of curvature when taken in another comprising a cuttermounted on a flexible plate straight line direction. which may be bentby the application of pres- For a better understanding of our invention,sure to conform to the curvature of the surface reference is made to theaccompanying drawings to be cut.

wherein the various reference characters desig- The device may beconstructed so that it may nate corresponding parts in the severalfigures. be operated mechanically rather than manually. Fig. 1 is anelevational view in section of one Such alteration is well within theskill of the art.

embodiment of our invention showing the cut- It is also apparent thatclamping means other ting tool in place on a curved surface to be cut;than that shown may be employed in place of Fig. 2 is a plan view of theembodiment as the stud, collar, and nut; and other types of cutshown inFig. 1; and ters than that shown, for example circular cut- Fig. 3 is anelevational view showing the tool ters, may be used.

in operative position. A device such as that shown in the drawings Inthe embodiment of our invention shown in has been eminently suitable foruse in the repair the several figures, stud l is mounted in a collar ofdamaged parts of aircraft which, due to 2, fitted with bearing 3. Thethreaded part of streamlining design, are usually curved. It can stud lis passed through a hole in the material also be used for cutting holesin any curved surto be cut, represented by curved sheet X. The face suchas that of cylinder, tank, and the collar 2 is pressed against sheet Xand is held like, Whether made of wood, metal, resin, or the in positionby nut 4. The face of the collar 2 like.

is preferably serrated to prevent slippage of the We claim:

tool in relation to the sheet X. A partially 1. A tool adapted to cutapertures in curved slotted tubular member 5 is rotatably mounted onsurfaces comprising a base having a, clamp, a bearing 3 and supportsparallel arms 6 which are member extendin from and supported by saidjoined together and pivoted at one end to membase and adapted to rotateabout an axis conber 5 by means of pin 7. Arms 6 may be forced centricthereto and to said base, an arm pivoted downward by pressure on knob 8,which is rotatadjacent one end thereof to and extending from ablymounted on a pin pivotally attached to said said member at an angl tothe axis aforesaid, arms 6 near the extremity thereof. A cutter ID aflexible plate attached at one end to and exis supported by and passesthrough collar II and tending from the end of said member adjacent isheld in place by set-screw l2. The shaft of said base, a cutting elementsupported by and cutter l0 passes between the parallel arms 6 butextending through an aperture in said flexible is not attached thereto.Collar H is mounted on plate and having a portion thereof in slidable aflexible plate 9, one end of which is attached engagement with said arm,and means interto the lower extremity of tubular member 5. Cutposedbetween said arm and said plate whereby ter Ill extends through a holein plate 9 and is rotation of the arm about its pivot imparts moveheldin position by pins l3 attached to plate 9 ment to the flexible plateand cutting element which engage holes drilled in collar ll. supportedthereby.

2,401,420 3 4 2. A tool adapted to cut apertures in curved a cuttingelement supported by and extending surfaces comprising a base having a,clamp, a through an aperture in said flexible support, and memberextending from and supported by said means for applying pressure to saidcutting elebase and adapted to rotate about an axis conment whereby itmay be brought into contact centric to said member and said base, aflexible 5 with said surface and rotated about said axis. supportattached at one end to and extending EDMUND GREENE. from the end of saidmember adjacent said base, HENRY F. PEARSON.

